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Posted to jira@arrow.apache.org by "Daniël Heres (Jira)" <ji...@apache.org> on 2021/01/03 11:04:00 UTC

[jira] [Created] (ARROW-11116) [Rust][DataFusion] More efficient LEFT join implementation

Daniël Heres created ARROW-11116:
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             Summary: [Rust][DataFusion] More efficient LEFT join implementation
                 Key: ARROW-11116
                 URL: https://issues.apache.org/jira/browse/ARROW-11116
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust - DataFusion
            Reporter: Daniël Heres


Currently, the left join implementation keeps a HashSet<Vec<u8>> to mark each key as visited.

However, a more efficient choice would be to keep a bitmap or a boolean marker for each key or index and mark the row as visited, avoiding unnecessary hashing, copying / memory usage.



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